Speed up background jobs populate_full_user_id_user_filters and populate_full_user_id_profiles (#15700)

Author: H-Shay

Diff for: changelog.d/15700.misc

@@ -0,0 +1 @@
+Speed up background jobs `populate_full_user_id_user_filters` and `populate_full_user_id_profiles`.

Diff for: synapse/storage/databases/main/filtering.py

@@ -71,7 +71,7 @@ def _get_last_id(txn: LoggingTransaction) -> Optional[str]:
                     SELECT user_id FROM user_filters
                     WHERE user_id > ?
                     ORDER BY user_id
-                    LIMIT 1 OFFSET 50
+                    LIMIT 1 OFFSET 1000
                   """
             txn.execute(sql, (lower_bound_id,))
             res = txn.fetchone()

Diff for: synapse/storage/databases/main/profile.py

@@ -65,7 +65,7 @@ def _get_last_id(txn: LoggingTransaction) -> Optional[str]:
                     SELECT user_id FROM profiles
                     WHERE user_id > ?
                     ORDER BY user_id
-                    LIMIT 1 OFFSET 50
+                    LIMIT 1 OFFSET 1000
                   """
             txn.execute(sql, (lower_bound_id,))
             res = txn.fetchone()